SonarSource Rules
  • Products

    In-IDE

    Code Quality and Security in your IDE with SonarQube Ide

    IDE extension that lets you fix coding issues before they exist!

    Discover SonarQube for IDE

    SaaS

    Code Quality and Security in the cloud with SonarQube Cloud

    Setup is effortless and analysis is automatic for most languages

    Discover SonarQube Cloud

    Self-Hosted

    Code Quality and Security Self-Hosted with SonarQube Server

    Fast, accurate analysis; enterprise scalability

    Discover SonarQube Server
  • SecretsSecrets
  • ABAPABAP
  • AnsibleAnsible
  • ApexApex
  • AzureResourceManagerAzureResourceManager
  • CC
  • C#C#
  • C++C++
  • CloudFormationCloudFormation
  • COBOLCOBOL
  • CSSCSS
  • DartDart
  • DockerDocker
  • FlexFlex
  • GitHub ActionsGitHub Actions
  • GoGo
  • HTMLHTML
  • JavaJava
  • JavaScriptJavaScript
  • JSONJSON
  • JCLJCL
  • KotlinKotlin
  • KubernetesKubernetes
  • Objective CObjective C
  • PHPPHP
  • PL/IPL/I
  • PL/SQLPL/SQL
  • PythonPython
  • RPGRPG
  • RubyRuby
  • RustRust
  • ScalaScala
  • SwiftSwift
  • TerraformTerraform
  • TextText
  • TypeScriptTypeScript
  • T-SQLT-SQL
  • VB.NETVB.NET
  • VB6VB6
  • XMLXML
  • YAMLYAML
C#

C# static code analysis

Unique rules to find Bugs, Vulnerabilities, Security Hotspots, and Code Smells in your C# code

  • All rules 493
  • Vulnerability46
  • Bug88
  • Security Hotspot24
  • Code Smell335

  • Quick Fix 61
Filtered: 6 rules found
redundant
    Impact
      Clean code attribute
        1. Null checks should not be combined with "is" operator checks

           Code Smell
        2. Jump statements should not be redundant

           Code Smell
        3. Nullable type comparison should not be redundant

           Bug
        4. Boolean expressions should not be gratuitous

           Code Smell
        5. Redundant casts should not be used

           Code Smell
        6. Overriding members should do more than simply call the same member in the base class

           Code Smell

        Redundant casts should not be used

        intentionality - clear
        maintainability
        Code Smell
        Quick FixIDE quick fixes available with SonarLint
        • redundant
        • clumsy

        Why is this an issue?

        How can I fix it?

        More Info

        Casting expressions are utilized to convert one data type to another, such as transforming an integer into a string. This is especially crucial in strongly typed languages like C, C++, C#, Java, Python, and others.

        However, there are instances where casting expressions are not needed. These include situations like:

        • casting a variable to its own type
        • casting a subclass to a parent class (in the case of polymorphism)
        • the programming language is capable of automatically converting the given type to another

        These scenarios are considered unnecessary casting expressions. They can complicate the code and make it more difficult to understand, without offering any advantages.

        As a result, it’s generally advised to avoid unnecessary casting expressions. Instead, rely on the language’s type system to ensure type safety and code clarity.

        Exceptions

        Issues are not raised against the default literal.

          Available In:
        • SonarQube IdeCatch issues on the fly,
          in your IDE
        • SonarQube CloudDetect issues in your GitHub, Azure DevOps Services, Bitbucket Cloud, GitLab repositories
        • SonarQube Community BuildAnalyze code in your
          on-premise CI
          Available Since
          9.1
        • SonarQube ServerAnalyze code in your
          on-premise CI
          Developer Edition
          Available Since
          9.1

        © 2008-2025 SonarSource SA. All rights reserved.

        Sonar helps developers write Clean Code.
        Privacy Policy | Cookie Policy | Terms of Use